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Pytest plugin for testing Python code examples in docstrings and markdown files.
pytest-examples
can:
ruff
and black
It can also update code examples in place to format them and insert or update print statements.
pip install -U pytest-examples
Here's an example basic usage - lint then run examples in the foo_dir
directory and the bar_file.py
file.
import pytest
from pytest_examples import find_examples, CodeExample, EvalExample
@pytest.mark.parametrize('example', find_examples('foo_dir', 'bar_file.py'), ids=str)
def test_docstrings(example: CodeExample, eval_example: EvalExample):
eval_example.lint(example)
eval_example.run(example)
pytest-examples
can also check print statements are inserted correctly.
There's the expected format of prints statemints in docstrings:
def add_two_things(a, b):
"""
```py
from my_lib import add_two_things
print(add_two_things(1, 2))
#> 3
```
"""
return a + b
And here's an example of a markdown file, again documenting add_two_things
:
# How `add_two_things` works
```py
from my_lib import add_two_things
print(add_two_things(1, 2))
#> 3
```
pytest-examples
can then run the code and check the print statements are correct:
import pytest
from pytest_examples import find_examples, CodeExample, EvalExample
@pytest.mark.parametrize('example', find_examples('foo_dir'), ids=str)
def test_docstrings(example: CodeExample, eval_example: EvalExample):
eval_example.run_print_check(example)
As well as checking linting and print statements, are correct, we can also update files.
This requires the --update-examples
flags AND use of the format()
and run_print_update()
methods.
Here's a full example of a unit test that checks code when called normally, but can update it when the flag is set:
import pytest
from pytest_examples import find_examples, CodeExample, EvalExample
@pytest.mark.parametrize('example', find_examples('README.md'), ids=str)
def test_readme(example: CodeExample, eval_example: EvalExample):
if eval_example.update_examples:
eval_example.format(example)
eval_example.run_print_update(example)
else:
eval_example.lint(example)
eval_example.run_print_check(example)
FAQs
Pytest plugin for testing examples in docstrings and markdown files.
We found that pytest-examples demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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